As housekeeping cpumasks can now be modified at run time, we need a way
to examine the their current values to see if they meet our expectation.
Add a new sched debugfs file "housekeeping_cpumasks" to dump out the
current values.
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
kernel/sched/debug.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 3f06ab84d53f..ba8f0334c15e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -490,6 +490,35 @@ static void debugfs_fair_server_init(void)
}
}
+#ifdef CONFIG_CPU_ISOLATION
+static int hk_cpumasks_show(struct seq_file *m, void *v)
+{
+ static const char * const hk_type_name[HK_TYPE_MAX] = {
+ [HK_TYPE_DOMAIN] = "domain",
+ [HK_TYPE_MANAGED_IRQ] = "managed_irq",
+ [HK_TYPE_KERNEL_NOISE] = "nohz_full"
+ };
+ int type;
+
+ for (type = 0; type < HK_TYPE_MAX; type++)
+ seq_printf(m, "%s: %*pbl\n", hk_type_name[type],
+ cpumask_pr_args(housekeeping_cpumask(type)));
+ return 0;
+}
+
+static int hk_cpumasks_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, hk_cpumasks_show, NULL);
+}
+
+static const struct file_operations hk_cpumasks_fops = {
+ .open = hk_cpumasks_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+#endif
+
static __init int sched_init_debug(void)
{
struct dentry __maybe_unused *numa;
@@ -525,6 +554,9 @@ static __init int sched_init_debug(void)
debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold);
#endif /* CONFIG_NUMA_BALANCING */
+#ifdef CONFIG_CPU_ISOLATION
+ debugfs_create_file("housekeeing_cpumasks", 0444, debugfs_sched, NULL, &hk_cpumasks_fops);
+#endif
debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
debugfs_fair_server_init();
--
2.50.0
